Patrick Lucas created FLINK-5801:
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Summary: Queryable State from Scala job/client fails with key of
type Long
Key: FLINK-5801
URL: https://issues.apache.org/jira/browse/FLINK-5801
Project: Flink
Issue Type: Bug
Components: Queryable State
Affects Versions: 1.2.0
Environment: Flink 1.2.0
Scala 2.10
Reporter: Patrick Lucas
Attachments: OrderFulfillment.scala, OrderFulfillmentStateQuery.scala
While working on a demo Flink job, to try out Queryable State, I exposed some
state of type Long -> custom class via the Query server. However, the query
server returned an exception when I tried to send a query:
{noformat}
Exception in thread "main" java.lang.RuntimeException: Failed to query state
backend for query 0. Caused by: java.io.IOException: Unable to deserialize key
and namespace. This indicates a mismatch in the key/namespace serializers used
by the KvState instance and this access.
at
org.apache.flink.runtime.query.netty.message.KvStateRequestSerializer.deserializeKeyAndNamespace(KvStateRequestSerializer.java:392)
at
org.apache.flink.runtime.state.heap.AbstractHeapState.getSerializedValue(AbstractHeapState.java:130)
at
org.apache.flink.runtime.query.netty.KvStateServerHandler$AsyncKvStateQueryTask.run(KvStateServerHandler.java:220)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.EOFException
at
org.apache.flink.runtime.util.DataInputDeserializer.readLong(DataInputDeserializer.java:217)
at
org.apache.flink.api.common.typeutils.base.LongSerializer.deserialize(LongSerializer.java:69)
at
org.apache.flink.api.common.typeutils.base.LongSerializer.deserialize(LongSerializer.java:27)
at
org.apache.flink.runtime.query.netty.message.KvStateRequestSerializer.deserializeKeyAndNamespace(KvStateRequestSerializer.java:379)
... 7 more
at
org.apache.flink.runtime.query.netty.KvStateServerHandler$AsyncKvStateQueryTask.run(KvStateServerHandler.java:257)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
{noformat}
I banged my head against this for a while, then per [~jgrier]'s suggestion I
tried simply changing the key from Long to String (modifying the two {{keyBy}}
calls and the {{keySerializer}} {{TypeHint}} in the attached code) and it
started working perfectly.
cc [~uce]
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